<style>
html{ background-color: #fff; }
iframe{ width:100%; border:none; box-sizing:border-box; vertical-align: middle; }
</style>

<div id="item">
    <iframe ng-src="{{resourceUrl(data.data_url)}}" ng-style="iframeStyle" ng-show="data"></iframe>
    <div class="empty" ng-show="!data">
        <br />
        <br />
        <br />
        <i class="iconfont icon-inothing"></i></a>
        <p>没有课件呢~</p>
    </div>
</div>
